Method Prep:15min › Extra time:3hr chilling › Ready in:3hr15min
Place the biscuits, sugar, butter and mixed spice into a 18cm (7 in) tart or pie dish. Distribute over the base of the dish and press gently with the back of a spoon to form a firm base. Chill in the fridge until firm.
Zest one of the lemons then juice them both. Combine the zest and juice with the cream and condensed milk in a large bowl. Whisk using a handheld mixer until thick and creamy. Remove the base from the fridge and spoon evenly on top.
Cut the grapes in half and remove seeds if necessary. Arrange in a pleasing pattern on top of the lemon cream then place in the fridge for several hours to chill. Remove from the fridge and enjoy.